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Gold extraction process method for refractory gold ore

The process of decomposing sulfate through sulfation roasting and secondary low-temperature acid roasting solves the problems of complex operation, high cost and large pollution in the gold extraction process from refractory gold ores, and achieves efficient gold ore extraction and environmentally friendly industrial production. .

Inactive Publication Date: 2014-08-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a process for extracting gold from refractory gold ore, so as to solve the complex operation, high cost and large pollution in the previous gold extraction methods , low withdrawal rate and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The flotation gold concentrate in Zhenyuan, Yunnan, contains 35.86g / t gold, 15.11% sulfur, 0.70% arsenic, 4.83% carbon, and a fineness of 70%-37um. The particle size of gold is fine, mainly wrapped in sulfide, accounting for 85.69%, bare gold alone accounts for 10.16%, and gold wrapped in gangue accounts for 4.15%. 0.005mm. The organic carbon content in the ore sample is as high as 1.11%, which has a strong ability to "rob gold". Direct cyanidation for 48 hours, the leaching rate of gold is only 1%.

[0032] Take 1000g of gold concentrate (dried), put it into the furnace when the temperature of the horse-boiling furnace is 400°C, and start to heat up to 650°C after 30 minutes, slightly open the furnace door (stir the ore powder three times in the middle), and roast for 60 minutes under temperature control. After cooling to normal temperature, the weight is 867g, and the slag yield is 86.7%.

[0033] Weigh 433.5g of slag, use 250gH 2 SO 4 (about 136ml) mixed with 15...

Embodiment 2

[0036] The flotation gold concentrate in Changan, Yunnan contains 37.60g / t gold, 3.47% arsenic and 22.82% sulfur. The particle size of gold embedding is extremely fine, basically less than 10um, with 2-10um accounting for the majority. Gold is filled in the gaps of arsenopyrite grains or on the edge of arsenopyrite in irregular granular form, or embedded with pyrite in cracks of pyrite, or contained in quartz in the form of fine granular inclusions. Direct cyanidation for 48 hours, the leaching rate of gold is only 13.7%.

[0037] Take 1000g of gold concentrate (dried), put it into the furnace when the temperature of the horse-boiling furnace is 400°C, and start to heat up to 650°C after 30 minutes, slightly open the furnace door (stir the ore powder three times in the middle), and roast for 60 minutes under temperature control. After cooling to normal temperature, the weight was 920g, and the slag yield was 92.0%.

[0038] Weigh 460g of slag, use 250gH 2 SO 4 (about 136ml...

Embodiment 3

[0041] Guangxi Jinya flotation gold concentrate contains 53.60g / t gold, 32.28% sulfur, 7.51% arsenic and 0.86% carbon. Direct cyanidation for 48 hours, the leaching rate of gold was 53.2%.

[0042] Take 1000g of gold concentrate (dried), put it into the furnace when the temperature of the horse-boiling furnace is 400°C, and start to heat up to 650°C after 30 minutes, slightly open the furnace door (stir the ore powder three times in the middle), and roast for 60 minutes under temperature control. After cooling to normal temperature, the weight is 858g, and the slag yield is 85.8%.

[0043] Weigh 429g of slag, use 250gH 2 SO 4 (about 136ml) mixed with 150ml of water, and then baked at low temperature. When the temperature of the horse-boiler furnace is 150°C, put it into the furnace and bake for 30 minutes. When the slurry is baked into a block, it is divided into small pieces by shoveling, and then the temperature is raised to 200°C and 250°C for 30 minutes each.

[0044] ...

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PUM

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Abstract

A gold extraction process method for refractory gold ore, which adopts the continuous operation of sulfation roasting-secondary low-temperature acid roasting of slag-medium-temperature sulfation decomposition-cyanide gold extraction, and utilizes the sulfuric acid produced in the conventional sulfation roasting process, The slag of conventional sulfation roasting is subjected to secondary low-temperature acid roasting and oxidation, followed by medium-temperature roasting to decompose sulfate, and then cyanide leaching after fine grinding, so that the refractory gold wrapped in carbon, arsenic, and sulfur can be efficiently recovered ; This method unifies the advantages and characteristics of the roasting oxidation method and the acid hot pressure oxidation method under normal pressure, and is compatible with the advantages of the two methods. The operating conditions are relatively mild, the reaction speed is fast, the process investment cost is low, the production cost is suitable, and the environment Friendly, easy to realize industrial production. This method is also suitable for other roasting-leaching hydrometallurgical systems.

Description

technical field [0001] The invention relates to an extraction process of gold ore, and in particular provides a process for extracting gold from refractory gold ore. Background technique [0002] The reserves of refractory gold ore account for 60% of the world's total gold reserves. With the depletion of easy-leachable gold ore resources in the world, the extraction of gold has gradually turned to refractory gold ore. This type of gold mine is mainly due to the existence of harmful elements such as carbon, sulfur, arsenic, etc., which affect the leaching of gold, especially the existence of organic carbon. So far, there is no effective method to improve the gold recovery rate of this type of gold mine. [0003] The traditional roasting oxidation method is a relatively mature pretreatment method for refractory gold ore. It can dissociate the wrapped gold in pyrite, arsenopyrite and other sulfides, and can comprehensively recover the sulfur and arsenic in it. But its disadvan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/06C22B11/08
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI